# What is sign of magnification?

## What is sign of magnification?

The sign of the magnification tells us the orientation of the image. If the sign is positive, then the image is upright. If the sign is negative, then the image is upside-down. In the examples above, we can see that amount by which an object will be magnified changes depending on its distance from the focal point.

## Is V negative in concave mirror?

you can easily verify that the focal length is in the positive x direction for a convex lens while it is along the negative x direction for a concave lens. So f is positive for a convex lens and negative for a concave lens. The reason is the sign altering of v.

## What is V for concave mirror?

The distance between the image and the pole of the mirror is called Image distance(v). The distance between the Principal focus and pole of the mirror is called Focal Length(f).

## Is V negative in convex lens?

Image distance (v) can be both positive and negative for convex lens and concave mirror depending on the position of the object. Image distance is always negative for a concave lens. Image distance is always positive for a convex mirror. The focal length is positive for convex lens and mirrors.

## Why is concave mirror always negative?

Since, object is always placed in front of the mirror hence the sign of object is taken as negative. Since, the centre of curvature and focus lie in front of the concave mirror, so signs of radius of curvature and focal length are taken as negative in the case of concave mirror.

## Why do we take object distance negative?

Answer. because according to sign convention distance is always measured from pole which is opposite to the direction of incident ray. Hence distance of the object always negative in the mirror.

## When should I take negative?

According to Cartesian sign convention, object distances (u) are always negative as the object is placed to the left of the mirror/lens. Focal length (f) is positive for a convex lens and convex mirror. Focal length is negative for concave lens and concave mirror.

## How do you know if an object is positive or negative?

Sign convention In other words, if the image is on the far side of the lens as the object, the image distance is positive and the image is real. If the image and object are on the same side of the lens, the image distance is negative and the image is virtual. For converging mirrors, the focal length is positive.

## Is object distance always positive?

Object distances are always positive. Real images are always inverted and virtual images are upright.

## What is object distance?

The object distance is the distance of the object to the centre line of the lens. This is denoted by the symbol do . The image distance (sometimes confused with the focal length) is the distance of the image to the centre line of the lens. This is denoted by the symbol di .

## Where should the object be moved to have a larger magnification?

Part D Where should the object be moved to have a larger magnification? ANSWER: The object should be moved closer to the lens.

## What optical device forms an image of same size real and upright?

(b) Makeup mirrors are perhaps the most common use of a concave mirror to produce a larger, upright image. A convex mirror is a diverging mirror (f is negative) and forms only one type of image. It is a case 3 image—one that is upright and smaller than the object, just as for diverging lenses.

## How will a convex lens change the image of an object?

A convex lens is thicker in the middle than at the edges. This causes rays of light to converge. The light forms a real or virtual image depending on the distance of the object from the lens.

## What type of image is formed if the location of the object is at F in a concave lens?

Image Formation by Concave Lens

Object location Image location Image nature
Infinity At F2 Virtual and Erect
Beyond infinity and 0 Between F1 and Optical centre Virtual and Erect

virtual images

## What is difference between concave and convex lens?

A concave lens is thinner in the middle and thicker at the edges. A convex lens is thicker in the middle and thinner at the edges. Used in the camera, focus sunlight, overhead projector, projector microscope, simple telescope, magnifying glasses, etc.

## What concave lenses do?

A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness (myopia).

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